There is a possibility conflict may break out by accident as a result of nuclear tests by North Korea, according to Chatham House.
The head of the policy institute's Asia programme, John Nilsson-Wright, was speaking to talkRADIO after the country claimed success in a fifth nuclear test.
He told Julia Hartley-Brewer: "We know relatively little about the regime because it's so close, and unfortunately I am tempted to say the media speculates a lot.
"This latest test is further proof the North Korean government is intent on developing its military capabilities. In a way it works because the international community is left relatively powerless in what they can do.
"There's always the risk that conflict might break out by accident," he added. "Now their nuclear accidents are becoming bigger and more destructive we need to be much more worried.
"[Kim Jong-un's] legitimacy hinges on his ability to do two things, to prove the country's military is secure and secondary to produce some form of economic prosperity, on the latter he's not been doing very well."
North Korea is continuing to defy UN resolutions by continuing the tests. South Korea believes this is the biggest test yet, as a 5.3 magnitude-tremor was detected near the site.
Listen to the full interview to find out more